letter 1998 Role of transvaginal sonography and endometrial biopsy in the evaluation of dysfunctional uterine bleeding in premenopausal women ·doi:10.1002/(sici)1097-0096(199803/04)26:3<180::aid-jcu14>3.0.co;2-f
article 1998 Role of transvaginal sonography and endometrial biopsy in the evaluation of dysfunctional uterine bleeding in premenopausal women ·doi:10.1002/(sici)1097-0096(199803/04)26:3<180::aid-jcu14>3.3.co;2-4